package com.tengfei.reflection;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * @Description:
 * @author: ten_fei
 * @date: 2021-07-15 20:45
 */
public class Test7 {

    //普通方式获取
    public static void test1() {
        User user = new User();
        long startTime = System.currentTimeMillis();

        for (int i = 0; i < 999999999; i++) {
            user.getName();
        }

        long endTime = System.currentTimeMillis();

        System.out.println("普通方式执行十亿次需要："+(endTime - startTime) + "ms");
    }

    // 反射方式获取
    public static void test2() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user = new User();
        Class c1 = user.getClass();
        Method getName = c1.getDeclaredMethod("getName", null);
        long startTime = System.currentTimeMillis();

        for (int i = 0; i < 999999999; i++) {
            getName.invoke(user, null);
        }

        long endTime = System.currentTimeMillis();

        System.out.println("反射方式执行十亿次需要："+(endTime - startTime) + "ms");
    }

    public static void test3() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user = new User();
        Class c1 = user.getClass();
        Method getName = c1.getDeclaredMethod("getName", null);
        getName.setAccessible(true);
        long startTime = System.currentTimeMillis();

        for (int i = 0; i < 999999999; i++) {
            getName.invoke(user, null);
        }

        long endTime = System.currentTimeMillis();

        System.out.println("反射方式执行十亿次需要(关闭检测)："+(endTime - startTime) + "ms");
    }

    public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        test1();
        test2();
        test3();
    }

}
